Lock-nut.



No. 735,992. v PATENTED AUG. 11, 1903.

by Z I a A t No. 735,992. ratented August 11,1903.

UNITED STATES ,PATENT OFFICE.

JOHN HENRY MARTIN,oE MEADVILLE, PENNSYLVANIA, AssIGNoR oFoNE- HALE To CHARLES MUENZENBERGER, or MEADvILLE, PENNSYLVANIA.

f y LOCK-NUT.

SPECIFICATION forming part of Letters-Patent No. 735,992, dated August 11 1903.

Application filed September 6,1902, Serial No. 122,388. '.No model To @ZZ whom, t may concern: When the improvement is formed on hex- Be it known that I, JOHN HENRY MARTIN, a agonal nuts', three of the transverse apertures citizen of the United States, residing at Meadand their accompanying protuberances will ville, in the county of Crawford and State of generally be employed through each alter- 55 Pennsylvania, have invented a new and usenate face of the nut, and when square nuts ful Lock- Nut, of which the following is a are employed two or four of the apertures and specification. protuberances may be employed, as required This invention relates to lock-nuts, and has but any number may be employed. for its object the production of a nut contain- For the purpose ofillustration the inven- 6o xo ing within itself and forming a part thereof tion is shown applied to an ordinary sixthe means for preventing itsreverse rotation; sided or hexagonal nut 10 withthree of the and the invention consists in a nut having transverse apertures (indicated at 1l) and yieldable protuberances extending from the the accompanying protuberances or projectinner face and containing` portions of the ing portions l2. 65 threads and adapted to forcibly embrace the In Fig. 2 a nut-blank is shown in transverse threads of the bolt when the nut is set up in section with the apertures ll'vformed therein place and thereby effectually lock `the nut to prior to the cutting of the threads, and in Fig. the bolt and prevent reverse rotation. 3 a similar View is shown after the threads In the drawings illustrative of the invenare cnt to illustrate the method of forming 7o zo tion, Figure l is a perspective view of a nut the improved nut;

having the improvements 'embodied therein. It will be noted by reference to Fig. 3 that Fig. 2 is a sectional view of a blank nut before portions of the thread are formed in the inner the threads are formed therein, and Fig. 8 faces of the protuberances or projecting-poris a similar view of the completed nut. Fig. tions 12, and then when the n ut is forced 75 4t is a transverse sectional view on the line down upon its seat and the protuberances IV IV of Fig. Fig. 5 is a view similar to compressed into the transverse openings and Fig. l, illustrating a modification in -the conin alinement with the general inner face of struction. the nut by the engagement with the faceof In this invention is comprised a .nut havthe object to be secured it will be obvious that 8o 3o ing one or Inore yieldable protuberances ex! the portions of the thread within the protutending from the inner face of the nut, berances will be clenchec against the the protuberances being formed' prior to threads of the bolt and firmly lock the nut in the cutting of the threads, so that when the place and prevent reverse rotation. threads are cut in the interior of the nut This makes a very complete, simple, and 85 they will also be formed in the inner faces of -cheaply constructed lock-nut which may be the protuberances, so that when the nutis applied to any of the various sizes and' forms screwed home upon its seat the protuberof' nuts and may be operated by the same ances will be compressed and the threads wrench which sets the nut home upon its seat therein likewise compressed with great forceV Aand will not require the exercise of more than 9o 4o against the threads of the bolt with which ya small amount of extra force to cause the they engage, thereby iirmly locking the nut clenching action of the protuberances. upon the bolt and preventing reverse rota- The amount of material between the apertion. These protuberances will preferably tures and the lower face of the nut will be sufbe formed by forcing a punch or other imiicient to resist any tendency to reverserota- 95 plement through the side of the nut-blank tion of the nut, but at the same time will yield sufficiently near the inner face to cause the to aforce applied to the nut, such asawre'nch, material of the nut to be pressed outward, to force it backward when, the nut isto be rebut the protuberances may be formed in any moved. -f f, suitable manner, and I do not wish, therefore, After the removal of the nut it may be read- Ioo 5o to be limited to any specific means for formily restored by forcing a punch into the apering them. tures and again pressing the material outward o LJ to re-form the protuberanees and realine the threads therein with the threads in the body of the nut.

Fig. 5 shows a modification of the manner of arranging the apertures, wherein one of the apertures is formed through each of the six sides of the nut and with additional apertures 13 alternating therewith and above them, which arrangement may be employed, if required; but this would not be a departure from the principle of the invention, as the results produced will be precisely the same as in the arrangement shown in the other iigures of the drawings.

If desired, the yieldable protuberances or projections might be formed by cutting away portions of the lower surface of the nut.

Having thus described the invention, what is claimed is- As a new article of manufacture, a locknut provided on its inner face with a yieldable protuberance and a cavity wholly inclosed by the body of the nut in proximity to the protuberance to permit said protuberance to be forced into the cavity to lock the nut in position.

2. As a new article of manufacture, a locknut provided with a central threaded opening, a transverse opening wholly inclosed by the body of the nut communicating with the central opening, the inner face of the nut above the transverse opening being extended beyond the plane thereof to form a yieldable protuberance, said protuberance being adapted to be compressed into the transverse opening to lock the nut in positio'n when the same is forcibly seated.

In testimony that I claim the foregoing as my own I have hereto affixed my signature in the presence of two witnesses. v

JOHN HENRY MARTIN. lVitnesses:

CHARLES MUENZENBERGER, SARA M. JOHNSON. 

